Improvement in compound engines



28h -f-Sh l. 'AHARTUPEl-i. ee Se* ImDFOvement in Compound Engines.

N0. 125,812l PatentedAprl16,872.

. y v2 Sheet--Sheer 2. A. HRTU PEE.

Improvement in Compound Engines. 119.125,812.

Panted Apr1116,1872.

NrTEE STATES PATENT GEEIGE.

ANDREW HARTUPEE, OF IITTSBUBG, PENNSYLVANIA.

IMPROVEMENT IN COMPOUND ENGINES.

SPECIFICATION.

To all whom it may concern:

Be it knownthat I, ANDREW HARTUPEE, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement i'n Steam-Engines; and I do hereby declare the following tobe a full, clear, and exact description thereof, reference being had tothe accompanying drawing, in two sheets, making a part of thisspecitication, in which- Figure l, Sheet l, is a perspective viewillustrative of my improvement. Fig. 2, Sheet 2, is a longitudinalvertical section thereof; and Fig. 3, Sheet 2, is a vertical sectionalview through lirst valve and valve-chest.

Like letters of reference indicate like parts in each.

My improvement relates to that class of double-cylinder steam-engines inwhich the steam, after having been used in one cylinder, is exhaustedtherefrom into another; the two cylinders being so arranged and iittedup withl such valves and ports that the pistons of both cylinders shallmove in the same direction at the same time. features of constructionand combination hereinafter set forth and claimed.

To enable others skilled in the art to make and use my improvement, Iwill proceed to describe its construction and mode of operation.

On any suitable bed, foundation, or frame,

A, rest the larger and smaller cylinders B B.f

Both have the same axial line. They are provided with the usual pistonsbd, and from these pistons the stems b el' lead to a common cross-head,D, which operates in the usual manner in the grooved slides D'. Thecylinders have the usual arrangement of steamports a a c c andexhaust-ports a c. These ports terminate at their outer ends in a seathaving the form of the segment of a cylinder, as shown in Fig. 2, and oneach of these seats is a rotary or oscillating valve, e e1. These valvesare mounted on stems c2, and the stems have at their outer ends a crankand link connection, ff', such that they shall receive a simultaneousthrow in either direction. Covering both valves is a box or case, E,called a moderator. It is divided by a diaphragm, g,

into two steam-chests, g1 g2. Steam is admitrEhe invention consists inthe ted by any suitable pipe, g3, from the steamgenerator into thesteam-chest g1, and passes thence alternately through the ports a to thecylinder B', so as to give to the piston d the desired motion. Theexhaust steam passes alternately from the opposite ends of the cylinderback through the ports a, under the valve c, into the exhaust-port a',which leads, as indicated by dotted lines in Fig. 2, from the ends ofthe steam-chest g1 outside the lefthand port a, to the other part of themoderator E, or into the steam-chest g2. From this it passes, by theports c c, alternately to the op'posite ends of the cylinder B, and,having done its work, escapes at the exhaust c in the usual manner. Anoil-cup is attached at p or other suitable point. l

With this arrangement of valves, ports, and valve-connections (the throwof the valves being secured in any suitable way) it will be seen thatsteam is admitted from each valve-chest to the same side of the pistonin each cylinder at the same time, so that its power will besimultaneously exerted in both to give a single motion to the cross-headD, and that the steam in this operation is used twice-#first in thesmaller cylinder B and then in the larger cylinder B, also, that, whilethe live steam is free to pass through the ports a a into the smallercylinder, it is, by the diaphragm g, preventedfrom entering the othersteam-chest, except as exhaust steam, from the smaller cylinder.

Fig. 3 illustrates another feature of my invention. The valve c isaffixed to a stem, e2, as already indicated. To avoid the necessity ofusing stutling-boxes on the bearings of this stem where they ordinarilypass through the ends of the steam-chest, I tix a packing-collar, s, onthe stem at such point that, when the valve is in proper position, theside or face of the collar will bear against the end of the steam-chestand pack the bearing ofthe stem at that point. The other end of the steme does not project through the steam-chest, but has a centering seat orrecess in its end, (or an equivalent centering device,) 1n which worksthe centering set-screw s'. By this means not only is the stem e2 keptaccurately in the center, but, also, the packing-collar s 1s held withvany desired pressure against the face of the valve-chest, and as eitherwears ble centering and adjusting device at the opposite end ofthe stem,for the purposes set forth.

3. The arrangement ot' the moderator E, Valve-crank f, and link f',substantially as set forth.

In testimony whereof I, the said ANDREW HARTUPEE, have hereunto set myhand.

ANDREW HARTUPEE.

Witnesses A. S. NICHOLSON, G. H. OHRIsTY.

